The announcement to launch MySQL 5.7 as a Developer Milestone Release. Download it, read the release notes, and refer to the manual. Tomas Ulin, Oracle’s VP of MySQL Engineering announced this and more at his keynote (video). Sheeri Cabral waxes lyrical about the hidden messages in the keynote.

TokuDB goes opensource. If you are interested in fractal tree indexes, this is the engine for you to use. To add, TokuDB not only works with MySQL/MariaDB, it also works with MongoDB.